Answer:
What coated the insides of Roman water pipes was mineral deposits.
Explanation:
Back in ancient Rome the water was rich in minerals, that would create a crust inside the aqueducts by deposition, coating the pipes and protecting the water from lead contamination.
Over time, the build-up of mineral deposits can clog the pipes, which requires periodic maintenance, in many cases the coating of the pipes could be accidentally removed.
The correct answer is B) "that activity can be justified by no one".
That is the only option written in formal English, as it uses correct grammar and standard English. The other sentences use informal language, as they are written the way they would be spoken: "know more and more", instead of "increasingly more", for example.
